Aussie 3.7-inch at Lae?

At around 18:56 in this video https://www.youtube.com/watch?v=A1F0tbxwXx8) an Aussie wooden-wheeled 3.7-inch howitzer is doing its thing; according to the narrator at Lae, New Guinea, during the Allied invasion of September 1943.

Incidentally, this 1951-vintage series "Crusade in the Pacific" in 24 half hour episodes, is probably the best original footage available on the Pacific war and beats any of the more recent productions.